Errors in Garmin Connect maps

09-14-2018, 07:26 AM

Hi,

Created a course in Garmin Connect , but there is an error with elevation data. There is a steep elevation loss and gain on the route I have created that I can confirm does not represent the true topgraphy. Just have a look at the screenshot from Garmin Connect.

Comment

ok. I went back to the course, put 2 waypoints outside the area that causes errors. Then I tried with all 3 maps and with follow road and popularity routing to redo the course creation by moving one of the waipoints along the course. The dip in elevation remains... But all maps option created a similar route. Looks like they all use the same source data in terms of topography.

Comment

Many digital systems use the same ellipsoid for the approximating the world ... WGS84 ...most times this is fine but in some areas this can be out by a lot. In the UK the Ordnance Survey use a different ellipsoid for approximating the earth around the British Isles. This is also backed up by the fact that Oslo has one of the highest recorded gravity g ... related to the high radius of the earth there ...